Drum-lining.



C. L. JOHNSON.

DRUM LINING. APPLICATION |-'l LED OCT. l9. IQH- RENEWED AUG. 25. 1911.

LMQHM. L Patented Dec. 11,1912:

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Specification of Letters Patent.

Patented Dec. 11, 1917.

application filed October-19,- 1914, SerialNo. 867,309. Renewed August 25, 1917. Serial No. 188,188. a

To all whom it may concern it knownthat I, CI-IAnLns L; JOHNSON,

a citizen of the United States, residing at- Dallas, in the county of Dallas and State of Texas, have invented certain new and useful improvements in Drum-Linings, of which the following is a specification.

My invention relates to a new and useful drum lining, and its object is to provide a drum lining for use in a cement pulverizer, which lining will be built up of cast iron staves leaded to the interior surface of the drum and having a tongue and groove connection between their abutting ends.

it further object of the invention is to provide a drum lining that will be strong, durable, simple and efficient and comparatively easy to construct.

With these and various other objects in view, my invention has relation to certain novel features of the construction and use, an example of which is described in the following specification and is illustrated in the accompanying drawing, wherein:

Figure 1 is a view showing in side eleva tion a portion of a drum equipped with my improved lining, the drum being shown broken away to some extent to reveal the lining construction.

1F ig. 2 is a transverse sectional view taken upon the line a-a of Fig. 1.

Fig. 8 is a sectional View taken upon the line 6-6 of Fig. 2.

Figs. 4: and 5 are detail perspective views of one of the cast iron staves which comprise niy drum lining said views rcspectively showing the rear and the front of said staves.

Referring now more particularly to the drawing, wherein like reference characters designate similar parts in all the figures,the

numeral 1 denotes a steel drum such as is commonly used in a cement pulverizer, and the numeral 2 designates a cast iron stave, a plurality of which are employed to build up the lining for the drum 1. The staves 2 are arranged within the drum. 1 in rows parallel to the axis of the drum the staves of each row being staggered with relation to those of the adjacent rows. The extremities of the staves are formed with a tongue 3 and a groove 4, a tongue and groove connection thus being established between the abutting ends of the staves of a row. The rear face of each stave is slightly raised adjacent to its extremities as is indicated by the numeral 6. Furthermore, tlie rear face of each stave 1s provlded wlth threeequally spaced tansverse grooves 7. The lateral edges of the staves are slightly raised adj acent to their extremities as is indicated at 7, and are also raised slightly midway be tween said extremities as indicated at 8. Thus between the staves of adjacent rows, narrow slits are formed as indicated at 8 in Fig. 1. Through the slits 8 a quantity of molten lead. is poured into the space in tervening between each stave and the lining, and this lead when cooled serves to securely hold the stave in place upon the drum wall. The grooves 7 upon the under faces of the stave serve as a retention for the lead. The inner or concave faces of the staves are formed with gradual longitudinal corruga tions as indicated at 10, these corrugations serving to carry the contents of the drum some distance up the sides thereof when the drum is rotating so that during the rotation of the drum the material will constantly be falling from the upwardly moving sides thereof to the bottom of the drum. The corrugated inner faces of the staves will be chilled so as to give superior wearing qualities.

By interposing a comparatively soft metal as lead between the hard metallic drum and lining, the effect of a padding is achieved, and the possibility of the staves being broken by any severe strain or shock is materially reduced. When the staves 2 become badly worn from use, they may be readily removed and replaced by a new linin The invention is presented as including all such modifications and changes as properly come within the scope of the following claims.

What is claimed is:

1. In a drum lining, a stave having at its respective extremities a tongue and a groove and having its rear face slightly thickened at the tongue and groove extremities, said stave having a slight thickening interme cliate of its ends said thickening being grooved.

2. In a drum lining, a stave having a corrugated inner face, a tongue and groove formed respectively at opposite ends of the stave, said stave having its rear face slightly thickened at the tongue and groove extremities and said stave having a slight thicken ing intermediate of its ends, said thickening being grooved, all of said thickenings and grooves 'bein transversely to the corrl gagrooves dividing the stave into frangible sec- 10 tions of the face of the stave. tions.

3. In a drum lining, a stave having at its In testimony whereof I have signed my respective extremities complementally \arname to this specification in the presence of" 5 ranged means of attachment to adjacent tWo subscribing Witnesses.

staves and having its rear face slightly CHARLES L. JOHNSON. thickened at the ektremit'ies, and at a point Witnesses:

intermediate cf said extremities, said rear R, E. C. BRUCKNER,

face being provided with a plurality of C. A. ELLIS.

Maples emm amt may ate attained for afltve cents each, by ama sing the Commie: at hunts,

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